linux-kernel - Re: USB keyboard recognized as HID keyboard but doesn't work

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Date:	Tue, 03 May 2011 11:40:24 +0200
From:	"Adi J. Sieker" <adi@...ker.io>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Jiri Kosina <jkosina@...e.cz>, Oliver Neukum <oliver@...kum.org>,
	USB list <linux-usb@...r.kernel.org>,
	linux-input@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: USB keyboard recognized as HID keyboard but doesn't work

On 03/05/11 00:29, Alan Stern wrote:
> On Mon, 2 May 2011, Adi J. Sieker wrote:
>
>>> Interestingly, the usbmon trace shows that the interrupt endpoint for
>>> interface 1 isn't being used by usbhid.  I don't know why, but it
>>> shouldn't make much difference for your purposes since that interface
>>> appears to be associated with the gaming interface.  But maybe I'm
>>> wrong and it is important somehow...
>>>
>>> The other noticeable thing is that the keyboard didn't accept the
>>> Set-Idle request for interface 1.
>>>
>>> You said before that the keyboard worked okay when driven by a guest
>>> Windows OS, right?  Can you collect an equivalent usbmon trace for
>>> that?  Comparing the two traces may be instructive.
>>
>> I hope this is what you meant. :)
>> Attached is a usbmon trace when I attach the keyboard to a VBox VM
>> running a Windows XP guest. I have no idea how to get a USB trace from
>> within Windows. The last block is when I pressed h twice in the Windows
>> XP guest.
>
> This is perfect.  It shows that the H key is reported using the
> interrupt endpoint on interface 1, which explains why it's not working
> with usbhid.  It also shows that the rejected Set-Idle request doesn't
> matter.
>
Do you know of a way for me to tell the kernel/usbhid to use interface 1 
and ignore interface 0?

Thanks
    Adi
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